thodg/libgit2/src/thread-utils.c

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• Hash : 0c7f49dd
  Author :
  Date : 2017-06-30T13:39:01
  

  Make sure to always include "common.h" first
  
  Next to including several files, our "common.h" header also declares
  various macros which are then used throughout the project. As such, we
  have to make sure to always include this file first in all
  implementation files. Otherwise, we might encounter problems or even
  silent behavioural differences due to macros or defines not being
  defined as they should be. So in fact, our header and implementation
  files should make sure to always include "common.h" first.
  
  This commit does so by establishing a common include pattern. Header
  files inside of "src" will now always include "common.h" as its first
  other file, separated by a newline from all the other includes to make
  it stand out as special. There are two cases for the implementation
  files. If they do have a matching header file, they will always include
  this one first, leading to "common.h" being transitively included as
  first file. If they do not have a matching header file, they instead
  include "common.h" as first file themselves.
  
  This fixes the outlined problems and will become our standard practice
  for header and source files inside of the "src/" from now on.
  

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• src/thread-utils.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "common.h"
  #include "thread-utils.h"
  
  #ifdef _WIN32
  #ifndef WIN32_LEAN_AND_MEAN
  #	define WIN32_LEAN_AND_MEAN
  #endif
  #	include <windows.h>
  #elif defined(hpux) || defined(__hpux) || defined(_hpux)
  #	include <sys/pstat.h>
  #endif
  
  /*
   * By doing this in two steps we can at least get
   * the function to be somewhat coherent, even
   * with this disgusting nest of #ifdefs.
   */
  #ifndef _SC_NPROCESSORS_ONLN
  #	ifdef _SC_NPROC_ONLN
  #		define _SC_NPROCESSORS_ONLN _SC_NPROC_ONLN
  #	elif defined _SC_CRAY_NCPU
  #		define _SC_NPROCESSORS_ONLN _SC_CRAY_NCPU
  #	endif
  #endif
  
  int git_online_cpus(void)
  {
  #ifdef _SC_NPROCESSORS_ONLN
  	long ncpus;
  #endif
  
  #ifdef _WIN32
  	SYSTEM_INFO info;
  	GetSystemInfo(&info);
  
  	if ((int)info.dwNumberOfProcessors > 0)
  		return (int)info.dwNumberOfProcessors;
  #elif defined(hpux) || defined(__hpux) || defined(_hpux)
  	struct pst_dynamic psd;
  
  	if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
  		return (int)psd.psd_proc_cnt;
  #endif
  
  #ifdef _SC_NPROCESSORS_ONLN
  	if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
  		return (int)ncpus;
  #endif
  
  	return 1;
  }
  

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